Quite numerous: Derry-Tyrone-Down etc. Ir. Mac Raghnaill. A name of both Irish and Scottish origin. Generally appearing as Reynolds.

Reynolds:

Very numerous: N Leinster, Connacht, E Ulster etc. This English name has taken the place of Ir. Mac Raghnaill, which derives from first name Raghnall, of Norse origin. The sept were located in Leitrim and this is still the centre of their distribution. Those in E Ulster may well be of English origin. IF.